Jake Posted April 29, 2019 Share Posted April 29, 2019 I have a 2001 F-550 that I am having a issue with injector High to Low codes, I have replaced the Injectors 2 years ago but only have about 10,000 miles on them. This truck is a service truck for a local farmer and he has had the following done here in the past 2 years... Injectors, Turbo, new exhaust(4"), new PCM and engine compartment wiring harness, new engine( that is why it is hear), new High pressure pump with IPR and ICP. I installed a new engine because he sucked the air filter up into the air tube and dusted the engine, lots of blow by, the engine is a jasper and I installed a new engine wiring harness, here is the problem I am having. I have three IDM's here, one is the orginal that he replaced, then one that is from Diesel select, and a master pro IDM from oriely's. I get a check engine light on when driving this truck only when I give it throttle under load then I let off and the check engine light goes out. P1316, check the IDM, buzz test, and here is where I get three different codes sets! Orginal IDM P1271,P1272,P1276,and P1277. Diesel Select IDM, P1271,P1272,P1273,P1274,P1275,P1276,P1277,and P1278. O'reily's IDM P0274,P0279,P1276,P1277,P1291,P1293,P1294,P1295. As you can see I am very confused with this, I have a set a 8 injectors here and plugged in a new injector into the #5 wiring and with the Diesel select IDM that code(P1275) goes away, perfect so I replace the right side bank injectors along with the under the valve cover wiring harness..... Buzz test I still get those Injectors expect 5 codes( P1271,73,77). I didn't think it was an injector issue and still don't but I need a little guidance here. I know I a missing things that I replaced so fire away and maybe we can get this handled for my customer, Thank you! Quote Link to comment Share on other sites More sharing options...
tonybullitt Posted April 30, 2019 Share Posted April 30, 2019 I had a similar issue one time. I ended up finding a good running truck not setting codes put it's IDM in problem solved. Don't remember how many I had tried but it was a lot. Quote Link to comment Share on other sites More sharing options...
tonybullitt Posted April 30, 2019 Share Posted April 30, 2019 Also what are u using to scan this. I question an up to date ids on old 7.3 I recently had a 7.3 truck with 4x4 issue and when I found an old scan tool that was only updated to 2006 it worked for what I needed Quote Link to comment Share on other sites More sharing options...
Jake Posted May 1, 2019 Author Share Posted May 1, 2019 I have a up to date IDS that I am using, I have a Ford IDM coming to try, this is the only thing that I can think of, I have ran into a bad batch of IDM's before but I have IDM's from two different company's that I am using, I will see it Friday so ill update as soon as I have it installed. Quote Link to comment Share on other sites More sharing options...
Bruce Amacker Posted May 3, 2019 Share Posted May 3, 2019 IIRC, they had an updated PN IDM for later trucks to prevent false codes. Quote Link to comment Share on other sites More sharing options...
Jake Posted May 3, 2019 Author Share Posted May 3, 2019 Thank you for the reply Bruce but I have googled IIRC for IDM's and am not getting anything, do you might telling me more about this please? Quote Link to comment Share on other sites More sharing options...
Bruce Amacker Posted May 3, 2019 Share Posted May 3, 2019 Not your problem, bad intel. https://www.thedieselstop.com/faq/9497faq/tsb/tsb/files/032134.pdf Quote Link to comment Share on other sites More sharing options...
Jake Posted May 9, 2019 Author Share Posted May 9, 2019 Well installed a Ford IDM and did a buzz test... PASSED, put all back together and let run for a while outside, test drove and the check engine light came back on, P1316, and it was bucking under load at first but didn't after I drove for a while, did buzz test again and wouldn't you know... P1271-P1278 codes for injector high to low circuit again. back to the old drawing board!!! Quote Link to comment Share on other sites More sharing options...
8WA Sman Posted May 9, 2019 Share Posted May 9, 2019 Check the harness at the left valve cover for rubbing. Did you load test the power and grounds circuits for the IDM? Switch out the IDM relay. There may be same helpful info here » Ford 7.3L Power Stroke Quote Link to comment Share on other sites More sharing options...
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